With the exception of emergency situations Easy Jet does not provide oxygen service during the flight. Small compressed air or oxygen cylinders are permitted in hand baggage for personal medical use only. They must not exceed 0.5 metres in length, with a maximum diameter of 250 mm. Passengers are permitted to carry max. 2 cylinders which must be placed in the overhead locker or under the seat. Cabin crew must be informed when boarding. Passengers will need a medical certificate confirming they are fit to fly and that oxygen cylinders carried on board are required for medical reasons. Oxygen concentrators (either mains or battery powered) are permitted on board and medical certification is not required. Batteries will have to be used with enough power for the duration of the trip, including possible delays.
Easyjet does not provide oxygen on board their aircraft, but will allow you to take your own. If you are taking your own oxygen you must ensure the cylinder is no longer than 0.5 metre long and 250 mm in diameter. In order to accommodate this you must have a medical certificate to confirm that it is for medical purposes and you are fit to fly.
If you suffer from asthma, you are allowed to carry inhalers and/or nebulisers. If you suffer from severe asthma or have recently been prescribed oral steroids, you will require certification confirming your fitness to fly.